came across this today by chance
I didn't think you could "turn-off" the satellites
( and you can detune them having experienced that myself in the middle of the Pacific 20 years ago or so )
anyway interesting summary of how they can de-tune it ...
and the location of Rus GPS groundstations
Russia will be disconnected from GPS in April-May 2022
"Roscosmos on April 22 will send technical proposals to the Ministry of Transport and the Federal Air Transport Agency to replace GPS with GLONASS subscriber equipment. It will also be able to receive a signal from the Chinese navigation system," Rogozin wrote on Twitter.
The consequences of disabling GPS
in Russia will be noticeable, but not critical.
To begin with, it is impossible to disconnect a particular country from the GPS purely technically. After all, the orbits of satellites are not stationary, so it is impossible to turn off the satellites responsible for a certain zone:
each satellite has too large a coverage area.
However, theoretically, it is possible to disable 11 GPS ground stations located in:
Kaluga and Sverdlovsk regions;
It is they who constantly refine the parameters improving the quality of navigation. This can lead to a decrease in the accuracy of satellite geodesy in Russia and a deterioration in positioning on devices to several hundred meters.
Russian ground stations in the United States.
You can't turn off GPS, but you can distort the data.
In 2008, this was already done
(this also confirms it is impossible to use GPS to hit a moving target re discussion above )